Organic light-emitting device

ABSTRACT

An organic light-emitting device including a first electrode, a second electrode facing the first electrode, and an organic layer including an emission layer between the first electrode and the second electrode, wherein the organic layer includes a first compound and a second compound, the first compound is selected from compounds represented by Formula 1, and the second compound is selected from compounds represented by Formula 2: 
     
       
         
         
             
             
         
       
     
     An organic light-emitting device including both compounds may exhibit high heat resistance and high durability, as well as a long lifespan and high efficiency.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and the benefit of Korean PatentApplication No. 10-2015-0129279, filed on Sep. 11, 2015, in the KoreanIntellectual Property Office, the entire content of which isincorporated herein by reference.

BACKGROUND

1. Field

One or more aspects of example embodiments of the present disclosure arerelated to an organic light-emitting device.

2. Description of the Related Art

Organic light-emitting devices are self-emission devices that have widerviewing angles, higher contrast ratios, and shorter response timescompared to devices of the related art. In addition, OLEDs may havebetter brightness, driving voltage, and response speed characteristics,and the ability to produce full-color images.

An organic light-emitting device may include a first electrode on asubstrate, and a hole transport region, an emission layer, an electrontransport region, and a second electrode sequentially positioned on thefirst electrode. Holes provided from the first electrode may move towardthe emission layer through the hole transport region, and electronsprovided from the second electrode may move toward the emission layerthrough the electron transport region. Carriers (such as holes andelectrons) may recombine in the emission layer to produce excitons.These excitons change (e.g., decay or transition) from an excited stateto a ground state to thereby generate light.

SUMMARY

One or more aspects of example embodiments of the present disclosure aredirected toward an organic light-emitting device having a highefficiency.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments.

One or more aspects of example embodiments of the present disclosureprovides an organic light-emitting device including a first electrode, asecond electrode facing the first electrode, and an organic layerincluding an emission layer between the first electrode and the secondelectrode, wherein the organic layer includes a first compound and asecond compound, the first compound is selected from compoundsrepresented by Formula 1, and the second compound is selected fromcompounds represented by Formula 2:

In Formulae 1 and 2,

ring A₁ may be selected from a C₅-C₃₀ carbocyclic group and a C₁-C₃₀heterocyclic group,

X₁ may be selected from oxygen (O) and sulfur (S),

L₁ to L₄ and L₂₁ to L₂₃ may each independently be selected from asubstituted or unsubstituted C₃-C₁₀ cycloalkylene group, a substitutedor unsubstituted C₁-C₁₀ heterocycloalkylene group, a substituted orunsubstituted C₃-C₁₀ cycloalkenylene group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenylene group, a substituted orunsubstituted C₆-C₆₀ arylene group, a substituted or unsubstitutedC₁-C₆₀ heteroarylene group, a substituted or unsubstituted divalentnon-aromatic condensed polycyclic group, and a substituted orunsubstituted divalent non-aromatic condensed heteropolycyclic group,

a1 to a4 and a21 to a23 may each independently be selected from 0, 1, 2,and 3,

R₁ to R₆, R₁₁, R₁₂, and R₂₁ to R₂₃ may each independently be selectedfrom hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, asubstituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted orunsubstituted C₂-C₆₀ alkynyl group, a substituted or unsubstitutedC₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkylgroup, a substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, —Si(Q₁)(Q₂)(Q₃), —B(Q₄)(Q₅), and —N(Q₆)(Q₇),

b1 to b6 and b21 to b23 may each independently be an integer selectedfrom 0 to 10,

n21 to n23 may each independently be an integer selected from 0 to 4,and

at least one substituent of the substituted C₅-C₃₀ carbocyclic group,substituted C₁-C₃₀ heterocyclic group, substituted C₁-C₁₀heterocycloalkylene group, substituted C₃-C₁₀ cycloalkenylene group,substituted C₁-C₁₀ heterocycloalkenylene group, substituted C₆-C₆₀arylene group, substituted C₁-C₆₀ heteroarylene group, substituteddivalent non-aromatic condensed polycyclic group, substituted divalentnon-aromatic condensed heteropolycyclic group, substituted C₁-C₆₀ alkylgroup, substituted C₂-C₆₀ alkenyl group, substituted C₂-C₆₀ alkynylgroup, substituted C₁-C₆₀ alkoxy group, substituted C₃-C₁₀ cycloalkylgroup, substituted C₁-C₁₀ heterocycloalkyl group, substituted C₃-C₁₀cycloalkenyl group, substituted C₁-C₁₀ heterocycloalkenyl group,substituted C₆-C₆₀ aryl group, substituted C₆-C₆₀ aryloxy group,substituted C₆-C₆₀ arylthio group, substituted C₁-C₆₀ heteroaryl group,substituted monovalent non-aromatic condensed polycyclic group, andsubstituted monovalent non-aromatic condensed heteropolycyclic group maybe selected from the group consisting of:

deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and aC₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group,—Si(Q₁₁)(Q₁₂)(Q₁₃), —B(Q₁₄)(Q₁₅), and —N(Q₁₆)(Q₁₇),

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group, each substituted with at least oneselected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynylgroup, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —Si(Q₂₁)(Q₂₂)(Q₂₃), —B(Q₂₄)(Q₂₅), and—N(Q₂₆)(Q₂₇); and

—Si(Q₃₁)(Q₃₂)(Q₃₃), —B(Q₃₄)(Q₃₅), and —N(Q₃₆)(Q₃₇),

wherein Q₁ to Q₇, Q₁₁ to Q₁₇, Q₂₁ to Q₂₇, and Q₃₁ to Q₃₇ may eachindependently be selected from hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid group ora salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenylgroup, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group.

BRIEF DESCRIPTION OF THE DRAWING

These and/or other aspects will become apparent and more readilyappreciated from the following description of the example embodiments,taken in conjunction with the drawing, which is a schematic drawingillustrating a structure of an organic light-emitting device accordingto one or more embodiments of the present disclosure.

DETAILED DESCRIPTION

Reference will now be made in more detail to example embodiments,examples of which are illustrated in the accompanying drawing, whereinlike reference numerals refer to like elements throughout andduplicative descriptions thereof may not be provided. In this regard,the present example embodiments may have different forms and should notbe construed as being limited to the descriptions set forth herein.Accordingly, the example embodiments are merely described below, byreferring to the drawing, to explain aspects of the present description.As used herein, the term “and/or” includes any and all combinations ofone or more of the associated listed items. Expressions such as “atleast one selected from”, “one of”, “at least one selected from”, and“one selected from” when preceding a list of elements, modify the entirelist of elements and do not modify the individual elements of the list.

In the drawing, the thicknesses of layers, films, panels, regions, etc.,may be exaggerated for clarity. It will be understood that when anelement such as a layer, film, region, or substrate is referred to asbeing “on” another element, it can be directly on the other element orintervening element(s) may also be present. In contrast, when an elementis referred to as being “directly on” another element, no interveningelements are present.

An organic light-emitting device according to an embodiment of thepresent disclosure will be described with reference to the drawing.

The drawing is a schematic view of an organic light-emitting device 10according to an embodiment of the present disclosure. The organiclight-emitting device 10 includes a first electrode 110, an organiclayer 150, and a second electrode 190.

Hereinafter, the structure of an organic light-emitting device accordingto an embodiment of the present disclosure and a method of manufacturingan organic light-emitting device according to an embodiment of thepresent disclosure will be described in connection with the drawing.

In the drawing, a substrate may be under the first electrode 110 orabove the second electrode 190. The substrate may be a glass substrateor a transparent plastic substrate having excellent mechanical strength,thermal stability, transparency, surface smoothness, ease of handling,and/or water-resistance.

The first electrode 110 may be formed by depositing and/or sputtering amaterial for forming the first electrode 110 on the substrate. When thefirst electrode 110 is an anode, the material for the first electrode110 may be selected from materials with a high work function tofacilitate hole injection. The first electrode 110 may be a reflectiveelectrode or a transmissive electrode. The material for the firstelectrode 110 may be a transparent and/or highly conductive material,and non-limiting examples of such a material may include indium tinoxide (ITO), indium zinc oxide (IZO), tin oxide (SnO₂), and zinc oxide(ZnO). When the first electrode 110 is a semi-transmissive electrode ora reflective electrode, at least one selected from magnesium (Mg),aluminum (Al), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium(Mg—In), and magnesium-silver (Mg—Ag) may be used as a material forforming the first electrode 110.

The first electrode 110 may have a single-layer structure or amulti-layer structure including two or more layers. For example, thefirst electrode 110 may have a three-layered structure of ITO/Ag/ITO,but embodiments of the structure of the first electrode 110 are notlimited thereto.

An organic layer 150 may be on the first electrode 110. The organiclayer 150 may include an emission layer.

The organic layer 150 may further include a hole transport regionbetween the first electrode and the emission layer, and an electrontransport region between the emission layer and the second electrode.

The hole transport region may include at least one selected from a holeinjection layer (HIL), a hole transport layer (HTL), a buffer layer, andan electron blocking layer (EBL), and the electron transport region mayinclude at least one selected from a hole blocking layer (HBL), anelectron transport layer (ETL), and an electron injection layer (EIL),but embodiments of the present disclosure are not limited thereto.

The hole transport region may have a single-layered structure formed ofa single material, a single-layered structure formed of a plurality ofdifferent materials, or a multi-layered structure having a plurality oflayers formed of a plurality of different materials.

For example, the hole transport region may have a single-layeredstructure formed of a plurality of different materials, a structure ofhole injection layer/hole transport layer, a structure of hole injectionlayer/hole transport layer/buffer layer, a structure of hole injectionlayer/buffer layer, a structure of hole transport layer/buffer layer, ora structure of hole injection layer/hole transport layer/electronblocking layer, wherein layers of each structure are sequentiallystacked from the first electrode 110 in each stated order, butembodiments of the present disclosure are not limited thereto.

When the hole transport region includes a hole injection layer, the holeinjection layer may be formed on the first electrode 110 using one ormore suitable methods selected from vacuum deposition, spin coating,casting, a Langmuir-Blodgett (LB) method, ink-jet printing,laser-printing, and laser-induced thermal imaging.

When a hole injection layer is formed by vacuum deposition, the vacuumdeposition may be performed at a deposition temperature of about 100 toabout 500° C., at a vacuum degree of about 10⁻⁸ to about 10⁻³ torr, andat a deposition rate of about 0.01 to about 100 Å/sec, depending on thecompound to be deposited in the hole injection layer, and the structureof the hole injection layer to be formed.

When a hole injection layer is formed by spin coating, the spin coatingmay be performed at a coating rate of about 2,000 rpm to about 5,000rpm, and at a temperature of about 80° C. to 200° C., depending on thecompound to be deposited in the hole injection layer, and the structureof the hole injection layer to be formed.

When the hole transport region includes a hole transport layer, the holetransport layer may be formed on the first electrode 110 or on the holeinjection layer using one or more suitable methods selected from vacuumdeposition, spin coating, casting, a LB method, ink-jet printing,laser-printing, and laser-induced thermal imaging. When the holetransport layer is formed by vacuum deposition and/or spin coating, thedeposition and coating conditions for the hole transport layer may besimilar to the deposition and coating conditions used for the holeinjection layer.

The hole transport region may include the condensed cyclic compoundrepresented by Formula 1. For example, the hole transport region mayinclude the hole transport layer, wherein the hole transport layerincludes the condensed cyclic compound represented by Formula 1.

In some embodiments, the hole transport region may include at least oneselected from m-MTDATA, TDATA, 2-TNATA, NPB, β-NPB, TPD, Spiro-TPD,Spiro-NPB, methylated NPB, TAPC, HMTPD,4,4′,4″-tris(N-carbazolyl)triphenylamine (TCTA),polyaniline/dodecylbenzenesulfonic acid (PANI/DBSA),poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS),polyaniline/camphor sulfonic acid (PANI/CSA),(polyaniline)/poly(4-styrenesulfonate) (PANI/PSS), a compoundrepresented by Formula 201, and a compound represented by Formula 202:

In Formulae 201 and 202,

L₂₀₁ to L₂₀₅ may each be the same as described herein in connection withL₁,

xa1 to xa4 may each independently be selected from 0, 1, 2, and 3,

xa5 may be selected from 1, 2, 3, 4, and 5, and

R₂₀₁ to R₂₀₄ may each independently be selected from a substituted orunsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, and a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group.

For example, in Formulae 201 and 202,

L₂₀₁ to L₂₀₅ may each independently be selected from the groupconsisting of:

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorene group, a dibenzofluorenegroup, a phenanthrenylene group, an anthracenylene group, a pyrenylenegroup, a chrysenylene group, a pyridinylene group, a pyrazinylene group,a pyrimidinylene group, a pyridazinylene group, a quinolinylene group,an isoquinolinylene group, a quinoxalinylene group, a quinazolinylenegroup, a carbazolylene group, and a triazinylene group; and

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a pyrenylene group, a chrysenylene group, a pyridinylene group, apyrazinylene group, a pyrimidinylene group, a pyridazinylene group, aquinolinylene group, an isoquinolinylene group, a quinoxalinylene group,a quinazolinylene group, a carbazolylene group, and a triazinylenegroup, each substituted with at least one selected from deuterium, —F,—Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an aminogroup, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a fluorenyl group, aspiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, achrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, an isoindolyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, and a triazinyl group,

xa1 to xa4 may each independently be selected from 0, 1, and 2,

xa5 may be selected from 1, 2, and 3, and

R₂₀₁ to R₂₀₄ may each independently be selected from the groupconsisting of:

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, and a triazinyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, and a triazinyl group, each substituted with at leastone selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, abiphenyl group, a terphenyl group, a naphthyl group, an azulenyl group,a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, and a triazinyl group, but embodiments of the presentdisclosure are not limited thereto.

The compound represented by Formula 201 may be further represented byFormula 201A:

In some embodiments, the compound represented by Formula 201 may befurther represented by Formula 201A-1, but embodiments of the presentdisclosure are not limited thereto:

In some embodiments, the compound represented by Formula 202 may befurther represented by Formula 202A, but embodiments of the presentdisclosure are not limited thereto:

In Formulae 201A, 201A-1, and 202A, L₂₀₁ to L₂₀₃, xa1 to xa3, xa5, andR₂₀₂ to R₂₀₄ may each be the same as described herein in connection withFormulae 201 and 202, R₂₁₁ and R₂₁₂ may each be the same as describedherein in connection with R₂₀₃, and R₂₁₃ to R₂₁₇ may each independentlybe selected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, aC₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group,a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, and a monovalent non-aromaticcondensed heteropolycyclic group.

The compound represented by Formula 201 and the compound represented byFormula 202 may include Compounds HT1 to HT20, but embodiments of thepresent disclosure are not limited thereto.

The thickness of the hole transport region may be about 100 Å to about10,000 Å, and in some embodiments, about 100 Å to about 1,000 Å. Whenthe hole transport region includes at least one selected from a holeinjection layer and a hole transport layer, the thickness of the holeinjection layer may be about 100 Å to about 10,000 Å, and in someembodiments, about 100 Å to about 1,000 Å. The thickness of the holetransport layer may be about 50 Å to about 2,000 Å, and in someembodiments, about 100 Å to about 1,500 Å. When the thicknesses of thehole transport region, the hole injection layer, and the hole transportlayer are each within these ranges, satisfactory hole transportingcharacteristics may be obtained without a substantial increase indriving voltage.

The hole transport region may further include, in addition to thesematerials, a charge-generation material for the improvement ofconductive properties. The charge-generation material may behomogeneously or non-homogeneously dispersed in the hole transportregion.

The charge-generation material may be, for example, a p-dopant. Thep-dopant may be one selected from a quinone derivative, a metal oxide,and a cyano group-containing compound, but embodiments of the presentdisclosure are not limited thereto. Non-limiting examples of thep-dopant may include a quinone derivative (such astetracyanoquinonedimethane (TCNQ) and/or2,3,5,6-tetrafluoro-tetracyano-1,4-benzoquinonedimethane (F4-TCNQ)); ametal oxide (such as a tungsten oxide and/or a molybdenum oxide), andCompound HT-D1 (illustrated below), but embodiments of the presentdisclosure are not limited thereto.

The hole transport region may further include, in addition to the holeinjection layer and the hole transport layer, at least one selected froma buffer layer and an electron blocking layer. Since the buffer layermay compensate for an optical resonance distance according to awavelength of light emitted from the emission layer (e.g., be used toadjust the optical resonance distance to match the wavelength of lightemitted from the emission layer), the light-emission efficiency of aformed organic light-emitting device may be improved. Materials that areincluded in the hole transport region may be used in the buffer layer.The electron blocking layer may prevent or reduce injection of electronsfrom the electron transport region.

An emission layer may be formed on the hole transport region using oneor more suitable methods selected from vacuum deposition, spin coating,casting, a LB method, ink-jet printing, laser-printing, andlaser-induced thermal imaging. When the emission layer is formed byvacuum deposition or spin coating, the deposition and coating conditionsfor the emission layer may be similar to the deposition and coatingconditions used for the hole injection layer.

When the organic light-emitting device 10 is a full color organiclight-emitting device, the emission layer may be patterned into a redemission layer, a green emission layer, and/or a blue emission layer,according to a sub pixel. In some embodiments, the emission layer mayhave a stacked structure of a red emission layer, a green emissionlayer, and a blue emission layer, or may include a red-light emissionmaterial, a green-light emission material, and a blue-light emissionmaterial, which are mixed with each other in a single layer to therebyemit white light.

The emission layer may include a first compound and a second compound,the first compound may be selected from compounds represented by Formula1, and the second compound may be selected from compounds represented byFormula 2:

Ring A₁ in Formula 1 may be selected from a C₅-C₃₀ carbocyclic group andC₁-C₃₀ heterocyclic group.

For example, ring A₁ in Formula 1 may be selected from a benzene, anaphthalene, a fluorene, a spiro-fluorene, a phenanthrene, ananthracene, a pyrrole, a thiophene, a furan, an imidazole, a pyrazole, athiazole, an isothiazole, an oxazole, an isoxazole, a pyridine, apyrazine, a pyrimidine, a pyridazine, an iso-indole, an indole, anindazole, a quinoline, an isoquinoline, a benzoquinoline, a quinoxaline,a quinazoline, a phthalazinine, a naphthylidine, a phenanthroline, abenzimidazole, a benzofuran, a benzothiophene, a benzothiazole, abenzoxazole, an isobenzoxazole, and a triazine, but embodiments of thepresent disclosure are not limited thereto.

In some embodiments, ring A₁ in Formula 1 may be selected from abenzene, a naphthalene, an anthracene, a pyridine, a pyrimidine, aquinoline, an isoquinoline, a benzoquinoline, a quinoxaline, aquinazoline, and a phenanthroline, but embodiments of the presentdisclosure are not limited thereto.

In some embodiments, ring A1 may be selected from a benzene and anaphthalene.

X₁ in Formula 1 may be selected from oxygen (O) and sulfur (S). In someembodiments, X₁ in Formula 1 may be 0.

L₁ to L₄ and L₂₁ to L₂₃ in Formulae 1 and 2 may each independently beselected from a substituted or unsubstituted C₃-C₁₀ cycloalkylene group,a substituted or unsubstituted C₁-C₁₀ heterocycloalkylene group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenylene group, a substitutedor unsubstituted C₁-C₁₀ heterocycloalkenylene group, a substituted orunsubstituted C₆-C₆₀ arylene group, a substituted or unsubstitutedC₁-C₆₀ heteroarylene group, a substituted or unsubstituted divalentnon-aromatic condensed polycyclic group, and a substituted orunsubstituted divalent non-aromatic condensed heteropolycyclic group.

For example, L₁ to L₄ and L₂₁ to L₂₃ in Formulae 1 and 2 may eachindependently be selected from the group consisting of:

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, apyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a thiadiazolylene group, animidazopyridinylene group, and an imidazopyrimidinylene group; and

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, apyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a thiadiazolylene group, animidazopyridinylene group, and an imidazopyrimidinylene group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptylgroup, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, abiphenyl group, a terphenyl group, a pentalenyl group, an indenyl group,a naphthyl group, an azulenyl group, a heptalenyl group, an indacenylgroup, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group,a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a thiadiazolyl group, animidazopyridinyl group, an imidazopyrimidinyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃),—B(Q₃₄)(Q₃₅), and —N(Q₃₆)(Q₃₇),

wherein Q₃₁ to Q₃₇ may each independently be selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkylgroup, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, aC₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromaticcondensed polycyclic group, a monovalent non-aromatic condensedheteropolycyclic group, a biphenyl group, and a terphenyl group, butembodiments of the present disclosure are not limited thereto.

For example, L₁ to L₄ and L₂₁ to L₂₃ in Formulae 1 and 2 may eachindependently be selected from groups represented by Formulae 3-1 to3-18, but embodiments of the present disclosure are not limited thereto:

In Formulae 3-1 to 3-18,

Z₁ may be selected from hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid group ora salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxygroup, a C₂-C₂₀ alkynyl group, a C₁-C₂₀ alkoxy group, a phenyl group, abiphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group,a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenanthrenyl group, an anthracenyl group, a triphenylenylgroup, a pyrenyl group, a chrysenyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinoxalinyl group, a quinazolinylgroup, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a carbazolyl group, a triazinyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃),—B(Q₃₄)(Q₃₅), and —N(Q₃₆)(Q₃₇),

wherein Q₃₁ to Q₃₇ may each independently be selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkylgroup, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, aC₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromaticcondensed polycyclic group, a monovalent non-aromatic condensedheteropolycyclic group, a biphenyl group, and a terphenyl group,

d1 may be an integer selected from 1 to 4, d2 may be an integer selectedfrom 1 to 3, d3 may be an integer selected from 1 to 6, d5 may beselected from 1 and 2, d6 may be an integer selected from 1 to 5, and *and *′ may each indicate a binding site to a neighboring atom.

For example, L₁ to L₄ and L₂₁ to L₂₃ in Formulae 1 and 2 may eachindependently be selected from groups represented by Formulae 4-1 to4-26, but embodiments of the present disclosure are not limited thereto:

and * and *′ in Formulae 4-1 to 4-26 may each indicate a binding site toa neighboring atom.

a1 to a4 and a21 to a23 in Formulae 1 and 2 may each independently beselected from 0, 1, 2, and 3. a1 indicates the number of L₁ in Formula1, and when a1 is 2 or more, each L₁ group may be identical to ordifferent from each other. When a1 is 0, *-(L₁)_(a1)-*′ may be a singlebond. In some embodiments, a1 may be selected from 0, 1, and 2. In someembodiments, a1 may be selected from 0 and 1. a2 to a4 and a21 to a23may each be the same as described herein in connection with a1 inFormulae 1 and 2.

In some embodiments, in Formula 1, a1 may be 0, a2 may be 0, a3 may be0, and a4 may be 0; a1 may be 0, a2 may be 1, a3 may be 0, and a4 may be0; a1 may be 0, a2 may be 0, a3 may be 1, and a4 may be 0; or a1 may be0, a2 may be 1, a3 may be 1, and a4 may be 0, and in some embodiments,in Formula 2, a21 may be 1, a22 may be 0, and a23 may be 0, butembodiments of the present disclosure are not limited thereto.

In some embodiments, R₁ to R₆, R₁₁, R₁₂, and R₂₁ to R₂₃ in Formulae 1and 2 may each independently be selected from hydrogen, deuterium, —F,—Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an aminogroup, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a substituted orunsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl group, asubstituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted orunsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group,—Si(Q₁)(Q₂)(Q₃), —B(Q₄)(Q₅), and —N(Q₆)(Q₇).

For example, R₁ to R₆, R₁₁, R₁₂, and R₂₁ to R₂₃ in Formulae 1 and 2 mayeach independently be selected from the group consisting of:

hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a triazinyl group, a benzocarbazolyl group, and adibenzocarbazolyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a triazinyl group, a benzocarbazolyl group, and adibenzocarbazolyl group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenylgroup, a terphenyl group, a naphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenanthrenyl group, an anthracenyl group, a pyrenyl group, achrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, atriazinyl group, a benzocarbazolyl group, a dibenzocarbazolyl group,—Si(Q₃₁)(Q₃₂)(Q₃₃), —B(Q₃₄)(Q₃₅), and —N(Q₃₆)(Q₃₇); and

—Si(Q₁)(Q₂)(Q₃), —B(Q₄)(Q₅), and —N(Q₆)(Q₇),

wherein Q₁ to Q₇ and Q₃₁ to Q₃₇ may each independently be selected fromhydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenylgroup, a terphenyl group, a naphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenanthrenyl group, an anthracenyl group, a pyrenyl group, achrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and atriazinyl group, but embodiments of the present disclosure are notlimited thereto.

For example, R₁ to R₆, R₁₁, R₁₂, and R₂₁ to R₂₃ in Formulae 1 and 2 mayeach independently be selected from hydrogen, deuterium, —F, —Cl, —Br,—I, a methyl group, an ethyl group, a propyl group, an iso-propyl group,a butyl group, an iso-butyl group, a sec-butyl group, a tert-butylgroup, a methoxy group, an ethoxy group, an iso-propoxy group, a butoxygroup, an iso-butoxy group, a sec-butoxy group, a tert-butoxy group, anda group represented by any of Formulae 6-1 to 6-69, but embodiments ofthe present disclosure are not limited thereto:

In Formulae 6-1 to 6-69,

Y₁₁ may be selected from O, S, S(═O), S(═O)₂, C(Z₁₄)(Z₁₅), N(Z₁₆), andSi(Z₁₇)(Z₁₈),

Z₁₁ to Z₁₈ may each independently be selected from the group consistingof:

hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, and a phosphoric acidgroup or a salt thereof;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolylgroup, a thiophenyl group, a furanyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, apyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a benzimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, an oxadiazolyl group, atriazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, animidazopyridinyl group, and an imidazopyrimidinyl group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolylgroup, a thiophenyl group, a furanyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, apyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a benzimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, an oxadiazolyl group, atriazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, animidazopyridinyl group, and an imidazopyrimidinyl group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl group, a C₁-C₁₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group,an anthracenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group,an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, aquinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aquinoxalinyl group, a quinazolinyl group, a carbazolyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, an imidazopyridinyl group, animidazopyrimidinyl group, —Si(Q₂₁)(Q₂₂)(Q₂₃), —B(Q₂₄)(Q₂₅), and—N(Q₂₆)(Q₂₇); and

—Si(Q₃₁)(Q₃₂)(Q₃₃), —B(Q₃₄)(Q₃₅), and —N(Q₃₆)(Q₃₇),

wherein Q₁ to Q₃, Q₆, Q₇, Q₂₁ to Q₂₇ and Q₃₁ to Q₃₇ may eachindependently be selected from hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid group ora salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxygroup, a phenyl group, a biphenyl group, a terphenyl group, a naphthylgroup, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenylgroup, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenylgroup, a pyrenyl group, a chrysenyl group, and a carbazolyl group,

e1 may be an integer selected from 1 to 5, e2 may be 1 or 2, e3 may bean integer selected from 1 to 3, e4 may be an integer selected from 1 to4, e5 may be an integer selected from 1 to 5, e6 may be an integerselected from 1 to 6, e7 may be an integer selected from 1 to 7, and *may indicate a binding site to a neighboring atom.

In some embodiments, R₁ to R₆, R₁₁, R₁₂, and R₂₁ to R₂₃ in Formulae 1and 2 may each independently be selected from hydrogen, deuterium, —F,—Cl, —Br, —I, a methyl group, an ethyl group, a propyl group, aniso-propyl group, a butyl group, an iso-butyl group, a sec-butyl group,a tert-butyl group, a methoxy group, an ethoxy group, an iso-propoxygroup, a butoxy group, an iso-butoxy group, a sec-butoxy group, atert-butoxy group, and a group represented by any of Formulae 7-1 to7-83, but embodiments of the present disclosure are not limited thereto:

* in Formulae 7-1 to 7-83 may indicate a binding site to a neighboringatom.

In some embodiments, in Formulae 1 and 2, R₁, R₂, and R₂₁ may eachindependently be selected from groups represented by Formulae 7-1 to7-83, and R₃ to R₆, R₁₁, R₁₂, R₂₂, and R₂₃ may each independently beselected from hydrogen, deuterium, —F, —Cl, —Br, —I, a methyl group, anethyl group, a propyl group, an iso-propyl group, a butyl group, aniso-butyl group, a sec-butyl group, a tert-butyl group, a methoxy group,an ethoxy group, an iso-propoxy group, a butoxy group, an iso-butoxygroup, a sec-butoxy group, and a tert-butoxy group, but embodiments ofthe present disclosure are not limited thereto.

In some embodiments, R₁ may be a group represented by Formula 7-1, R₂and R₂₁ may each independently be selected from groups represented byFormulae 7-1 to 7-83, and R₃ to R₆, R₁₁, R₁₂, R₂₂, and R₂₃ may eachindependently be selected from hydrogen, deuterium, —F, —Cl, —Br, —I, amethyl group, an ethyl group, a propyl group, an iso-propyl group, abutyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group,a methoxy group, an ethoxy group, an iso-propoxy group, a butoxy group,an iso-butoxy group, a sec-butoxy group, and a tert-butoxy group, butembodiments of the present disclosure are not limited thereto.

b1 to b6 and b21 to b23 in Formulae 1 and 2 may each independently be aninteger selected from 0 to 10. b1 indicates the number of R₁ in Formula1, and when b1 is 2 or more, each R₁ group may be identical to ordifferent from each other. In some embodiments, b1 in Formula 1 may beselected from 0, 1, and 2. In some embodiments, b1 may be selected from0 and 1. b2 to b6 and b21 to b23 may each be the same as describedherein in connection with b1 and Formulae 1 and 2.

n21 to n23 in Formula 2 may each independently be an integer selectedfrom 0 to 4. n21 indicates the number of *-(L₂₁)_(a21)-(R₂₁)_(b21)-*′ inFormula 2, and when n21 is 2 or more, each *-(L₂₁)_(a21)-(R₂₁)_(b21)-*′moiety may be identical to or different from each other. In someembodiments, n21 may be selected from 0 and 1. n22 and n23 each may bethe same as described herein in connection with n21 and Formula 2.

For example, n21 may be 1, n22 may be 0, and n23 may be 0, butembodiments of the present disclosure are not limited thereto.

In some embodiments, the sum of n21, n22, and n23 is not 0.

In some embodiments, the first compound may be selected from compoundsrepresented by Formulae 1-1 to 1-4, but embodiments of the presentdisclosure are not limited thereto:

Ring A₁, X₁, L₁ to L₄, a1 to a4, R₁ to R₆, R₁₁, R₁₂, and b1 to b6 inFormulae 1-1 to 1-4 may each be the same as described herein inconnection with Formula 1.

In some embodiments, the first compound may be selected from compoundsrepresented by Formulae 1-1-1 to 1-1-4, but embodiments of the presentdisclosure are not limited thereto:

In Formulae 1-1-1 to 1-1-4,

X₁, L₂, L₃, a2, a3, R₂ to R₆, R₁₁, R₁₂, b2, and b4 to b6 may each be thesame as described herein in connection with Formula 1,

Z₁₁ may be selected from hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a C₁-C₂₀ alkyl group, aC₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, a fluorenylgroup, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a carbazolyl group, a benzocarbazolylgroup, and a dibenzocarbazolyl group,

b3a may be an integer selected from 0 to 4, b3b may be an integerselected from 0 to 6, and e1 may be an integer selected from 0 to 5.

In some embodiments, the second compound may be selected from compoundsrepresented by Formulae 2-1 and 2-2, but embodiments of the presentdisclosure are not limited thereto:

In Formulae 2-1 and 2-2,

L₂₁, a21, and b21 may each be the same as described herein in connectionwith Formula 2,

R_(21a) to R_(21d) may each be the same as described herein inconnection with R₂₁, R_(22a) to R_(22d) may each be the same asdescribed herein in connection with R₂₂, and R_(23a) to R_(23d) may eachbe the same as described herein in connection with R₂₃.

For example, the first compound may be selected from Compounds 1-1 to1-54, but embodiments of the present disclosure are not limited thereto:

In some embodiments, the second compound may be selected from Compounds2-1 to 2-24, but embodiments of the present disclosure are not limitedthereto:

The emission layer may further include a third compound.

In some embodiments, the third compound may be selected fromorganometallic complexes represented by Formula 401, but embodiments ofthe present disclosure are not limited thereto:

In Formula 401,

M may be selected from iridium (Ir), platinum (Pt), osmium (Os),titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium(Tb), and thulium (Tm),

X₄₀₁ to X₄₀₄ may each independently be selected from nitrogen (N) andcarbon (C),

rings A₄₀₁ and A₄₀₂ may each independently be selected from asubstituted or unsubstituted benzene, a substituted or unsubstitutednaphthalene, a substituted or unsubstituted fluorene, a substituted orunsubstituted spiro-fluorene, a substituted or unsubstituted indene, asubstituted or unsubstituted pyrrole, a substituted or unsubstitutedthiophene, a substituted or unsubstituted furan, a substituted orunsubstituted imidazole, a substituted or unsubstituted pyrazole, asubstituted or unsubstituted thiazole, a substituted or unsubstitutedisothiazole, a substituted or unsubstituted oxazole, a substituted orunsubstituted isoxazole, a substituted or unsubstituted pyridine, asubstituted or unsubstituted pyrazine, a substituted or unsubstitutedpyrimidine, a substituted or unsubstituted pyridazine, a substituted orunsubstituted quinoline, a substituted or unsubstituted isoquinoline, asubstituted or unsubstituted benzoquinoline, a substituted orunsubstituted quinoxaline, a substituted or unsubstituted quinazoline, asubstituted or unsubstituted carbazole, a substituted or unsubstitutedbenzimidazole, a substituted or unsubstituted benzofuran, a substitutedor unsubstituted benzothiophene, a substituted or unsubstitutedisobenzothiophene, a substituted or unsubstituted benzoxazole, asubstituted or unsubstituted isobenzoxazole, a substituted orunsubstituted triazole, a substituted or unsubstituted oxadiazole, asubstituted or unsubstituted triazine, a substituted or unsubstituteddibenzofuran, and a substituted or unsubstituted dibenzothiophene, andwhen A₄₀₁ has two or more substituents, the two or more substituents ofA₄₀₁ may bind (e.g., couple) to each other to form a saturated orunsaturated ring; when A₄₀₂ has two or more substituents, the two ormore substituents of A₄₀₂ may bind (e.g., couple) to each other to forma saturated or unsaturated ring,

at least one substituent of the substituted benzene, substitutednaphthalene, substituted fluorene, substituted spiro-fluorene,substituted indene, substituted pyrrole, substituted thiophene,substituted furan, substituted imidazole, substituted pyrazole,substituted thiazole, substituted isothiazole, substituted oxazole,substituted isoxazole, substituted pyridine, substituted pyrazine,substituted pyrimidine, substituted pyridazine, substituted quinoline,substituted isoquinoline, substituted benzoquinoline, substitutedquinoxaline, substituted quinazoline, substituted carbazole, substitutedbenzimidazole, substituted benzofuran, substituted benzothiophene,substituted isobenzothiophene, substituted benzoxazole, substitutedisobenzoxazole, substituted triazole, substituted oxadiazole,substituted triazine, substituted dibenzofuran, and substituteddibenzothiophene may be selected from the group consisting of:

deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and aC₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group(non-aromatic condensed polycyclic group), a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₄₀₁)(Q₄₀₂), —Si(Q₄₀₃)(Q₄₀₄)(Q₄₀₅),and —B(Q₄₀₆)(Q₄₀₇),

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —N(Q₄₁₁)(Q₄₁₂),—Si(Q₄₁₃)(Q₄₁₄)(Q₄₁₅), and —B(Q₄₁₆)(Q₄₁₇); and

—N(Q₄₂₁)(Q₄₂₂), —Si(Q₄₂₃)(Q₄₂₄)(Q₄₂₅), and —B(Q₄₂₆)(Q₄₂₇),

L₄₀₁ may be an organic ligand,

xc1 may be selected from 1, 2, and 3, and

xc2 may be selected from 0, 1, 2, and 3.

L₄₀₁ may be a monovalent, divalent, or trivalent organic ligand. Forexample,

L₄₀₁ may be selected from a halogen ligand (for example, chloride (Cl)and/or fluoride (F)), a diketone ligand (for example, acetylacetonate,1,3-diphenyl-1,3-propandionate, 2,2,6,6-tetramethyl-3,5-heptandionate,and/or hexafluoroacetonate), a carboxylic acid ligand (for example,picolinate, dimethyl-3-pyrazolecarboxylate, and/or benzoate), a carbonmonoxide ligand, an isonitrile ligand, a cyano ligand, and/or aphosphorus-based ligand (for example, phosphine and/or phosphite), butembodiments of the present disclosure are not limited thereto.

Q₄₀₁ to Q₄₀₇, Q₄₁₁ to Q₄₁₇, and Q₄₂₁ to Q₄₂₇ may each independently beselected from hydrogen, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, aC₆-C₆₀ aryl group, and a C₁-C₆₀ heteroaryl group.

When A₄₀₁ in Formula 401 has two or more substituents, the substituentsof A₄₀₂ may bind (e.g., couple) to each other to form a saturated orunsaturated ring.

When A₄₀₂ in Formula 401 has two or more substituents, the substituentsof A₄₀₂ may bind (e.g., couple) to each other to form a saturated orunsaturated ring.

When xc1 in Formula 401 is two or more, a plurality of ligands

in Formula 401 may be identical or different. When xc1 in Formula 401 istwo or more, A₄₀₁ and A₄₀₂ may be respectively connected (e.g., coupled)to A₄₀₁ and A₄₀₂ of other neighboring ligands via a linker (for example,a C₁-C₅ alkylene, —N(R′)— (wherein R′ may be a C₁-C₁₀ alkyl group or aC₆-C₂₀ aryl group) or C(═O)— therebetween), or directly (via a bond).

The phosphorescent dopant may be selected from Compounds PD1 to PD76,but embodiments of the present disclosure are not limited thereto:

In some embodiments, the third compound may be selected fromorganometallic complexes represented by Formula 501, but embodiments ofthe present disclosure are not limited thereto:

In Formula 501,

Ar₅₀₁ may be selected from the group consisting of:

a naphthalene, a heptalene, a fluorene, a spiro-fluorene, abenzofluorene, a dibenzofluorene, a phenalene, a phenanthrene, ananthracene, a fluoranthene, a triphenylene, a pyrene, a chrysene, anaphthacene, a picene, a perylene, a pentaphene, and anindenoanthracene; and

a naphthalene, a heptalene, a fluorene, a spiro-fluorene, abenzofluorene, a dibenzofluorene, a phenalene, a phenanthrene, ananthracene, a fluoranthene, a triphenylene, a pyrene, a chrysene, anaphthacene, a picene, a perylene, a pentaphene, and anindenoanthracene, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkylgroup, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, aC₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, aC₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclicgroup, a monovalent non-aromatic condensed heteropolycyclic group, and—Si(Q₅₀₁)(Q₅₀₂)(Q₅₀₃) (wherein Q₅₀₁ to Q₅₀₃ may each independently beselected from hydrogen, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, aC₆-C₆₀ aryl group, and a C₁-C₆₀ heteroaryl group),

L₅₀₁ to L₅₀₃ may each be the same as described herein in connection withL₁,

R₅₀₁ and R₅₀₂ may each independently be selected from the groupconsisting of:

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazole group, a triazinyl group, a dibenzofuranyl group, and adibenzothiophenyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a triazinyl group, a dibenzofuranyl group, and adibenzothiophenyl group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenylgroup, a terphenyl group, a naphthyl group, a fluorenyl group, aspiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group,a phenanthrenyl group, an anthracenyl group, a pyrenyl group, achrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, atriazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group,

xd1 to xd3 may each independently be selected from 0, 1, 2, and 3, and

xd4 may be selected from 1, 2, 3, and 4.

The third compound may include at least one selected from Compounds FD1to FD9;

The organic light-emitting device may concurrently (e.g.,simultaneously) include the compound represented by Formula 1 (which isthe first compound) and the compound represented by Formula 2 (which isthe second compound) in the emission layer. The compound represented byFormula 1 may include an xanthenyl group (in which X₁ in Formula 1 is O)or a thioxanthenyl group (in which X₁ in Formula 1 is S). Due to theinclusion of the xanthenyl group or thioxanthenyl group, the compoundrepresented by Formula 1 may have a high glass transition temperatureand/or a high melting point. The compound represented by Formula 2 has atriphenylenyl group, and due to the inclusion of the triphenylenylgroup, the compound represented by Formula 2 may have a high T1(triplet) energy level (e.g., about 2.6 to 2.7 eV). Accordingly, anorganic light-emitting device concurrently (e.g., simultaneously)including the compound represented by Formula 1 and the compoundrepresented by Formula 2 may exhibit high heat resistance and highdurability, thereby having a long lifespan, and due to the increasedbalance between electrons and holes, the organic light-emitting devicemay show high efficiency.

In some embodiments, the first compound and the second compound includedin the emission layer may act as a host, and the third compound includedin the emission layer may act as a dopant.

In some embodiments, the emission layer includes a host and a dopant,and the host may include the first compound and the second compound, andthe dopant may include the third compound.

An organic light-emitting device including the first compound, thesecond compound, and the third compound may be a phosphorescent device.The organic light-emitting device may have a long wavelength in the redemission region, and accordingly, its color region may be wide, therebyproviding a wide color gamut.

In some embodiments, the weight ratio of the first compound to thesecond compound in the emission layer may be 1:9 to 9:1.

In some embodiments, the weight ratio of the host and the dopant in theemission layer may be 7:3 to 9.5:0.5. In some embodiments, the weightratio of the host and the dopant in the emission layer may be 8:2 to9:1. However, the weight ratio thereof is not limited to these ranges.

The term “organic layer” used herein may refer to a single layer and/ora plurality of layers between the first electrode and the secondelectrode of an organic light-emitting device. The material included inthe “organic layer” is not limited to being an organic material.

The thickness of the emission layer may be about 100 Å to about 1,000 Å,and in some embodiments, about 200 Å to about 600 Å. When the thicknessof the emission layer is within this range, excellent light-emissioncharacteristics may be obtained without a substantial increase indriving voltage.

An electron transport region may be on the emission layer.

The electron transport region may include at least one selected from ahole blocking layer, an electron transport layer (ETL), and an electroninjection layer, but embodiments of the present disclosure are notlimited thereto.

For example, the electron transport region may have a structure ofelectron transport layer/electron injection layer or a structure of holeblocking layer/electron transport layer/electron injection layer,wherein layers of each structure are sequentially stacked on theemission layer in each stated order, but the structures of embodimentsof the present disclosure are not limited thereto.

According to an embodiment of the present disclosure, the organic layer150 of the organic light-emitting device may include an electrontransport region between the emission layer and the second electrode190.

When the electron transport region includes a hole blocking layer, thehole blocking layer may be formed on the emission layer using one ormore suitable methods selected from vacuum deposition, spin coating,casting, a LB method, ink-jet printing, laser-printing, andlaser-induced thermal imaging. When a hole blocking layer is formed byvacuum deposition and/or spin coating, the deposition and coatingconditions for the electron transport layer may be similar to thedeposition and coating conditions used for the hole injection layer.

The hole blocking layer may include, for example, at least one selectedfrom BCP and Bphen, but embodiments of the present disclosure are notlimited thereto:

The thickness of the hole blocking layer may be about 20 Å to about1,000 Å, and in some embodiments, about 30 Å to about 300 Å. When thethickness of the hole blocking layer is within these ranges, the holeblocking layer may have improved hole blocking ability without asubstantial increase in driving voltage.

The electron transport region may include an electron transport layer.The electron transport layer may be formed on the emission layer or onthe hole blocking layer using one or more suitable methods selected fromvacuum deposition, spin coating, casting, a LB method, ink-jet printing,laser-printing, and laser-induced thermal imaging. When an electrontransport layer is formed by vacuum deposition and/or spin coating, thedeposition and coating conditions for the electron transport layer maybe similar to the deposition and coating conditions used for the holeinjection layer.

In some embodiments, the electron transport layer may include at leastone compound selected from a compound represented by Formula 601 and acompound represented by Formula 602 illustrated below:

Ar₆₀₁-[(L₆₀₁)_(xe1)-E₆₀₁]_(xe2).  Formula 601

In Formula 601,

Ar₆₀₁ may be selected from the group consisting of:

a naphthalene, a heptalene, a fluorene, a spiro-bifluorene, abenzofluorene, a dibenzofluorene, a phenalene, a phenanthrene, ananthracene, a fluoranthene, a triphenylene, a pyrene, a chrysene, anaphthacene, a picene, a perylene, a pentaphene, and anindenoanthracene; and

a naphthalene, a heptalene, a fluorene, a spiro-bifluorene, abenzofluorene, a dibenzofluorene, a phenalene, a phenanthrene, ananthracene, a fluoranthene, a triphenylene, a pyrene, a chrysene, anaphthacene, a picene, a perylene, a pentaphene, and anindenoanthracene, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkylgroup, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, aC₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, aC₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclicgroup, a monovalent non-aromatic condensed heteropolycyclic group, and—Si(Q₃₀₁)(Q₃₀₂)(Q₃₀₃) (wherein Q₃₀₁ to Q₃₀₃ may each independently beselected from hydrogen, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, aC₆-C₆₀ aryl group, or a C₁-C₆₀ heteroaryl group),

L₆₀₁ may be the same as described herein in connection with L₂₀₁,

E₆₀₁ may be selected from the group consisting of:

a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinylgroup, and an imidazopyrimidinyl group; and

a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, anindolyl group, an indazolyl group, a purinyl group, a quinolinyl group,an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinylgroup, and an imidazopyrimidinyl group, each substituted with at leastone selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, abiphenyl group, a terphenyl group, a pentalenyl group, an indenyl group,a naphthyl group, an azulenyl group, a heptalenyl group, an indacenylgroup, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, anaphthacenyl group, a picenyl group, a perylenyl group, a pentaphenylgroup, a hexacenyl group, a pentacenyl group, a rubicenyl group, acoronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenylgroup, a furanyl group, an imidazolyl group, a pyrazolyl group, athiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolylgroup, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, apyridazinyl group, an isoindolyl group, an indolyl group, an indazolylgroup, a purinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, and animidazopyrimidinyl group,

xe1 may be selected from 0, 1, 2, and 3, and

xe2 may be selected from 1, 2, 3, and 4.

In Formula 602,

X₆₁₁ may be selected from N and C-(L₆₁₁)_(xe611)-R₆₁₁, X₆₁₂ may beselected from N and C-(L₆₁₂)_(xe612)-R₆₁₂, X₆₁₃ may be selected from Nand C-(L₆₁₃)_(xe613)-R₆₁₃, and at least one selected from X₆₁₁ to X₆₁₃may be N,

L₆₁₁ to L₆₁₆ may each be the same as described herein in connection withL₁,

R₆₁₁ to R₆₁₆ may each independently be selected from the groupconsisting of:

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, and a triazinyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, and a triazinyl group, each substituted with at leastone selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, abiphenyl group, a terphenyl group, a naphthyl group, an azulenyl group,a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, and a triazinyl group, and

xe611 to xe616 may each independently be selected from 0, 1, 2, and 3.

The compound represented by Formula 601 and the compound represented byFormula 602 may each independently be selected from Compounds ET1 toET15:

In some embodiments, the electron transport layer may include at leastone selected from BCP, Bphen, Alq₃, Balq, TAZ, and NTAZ.

The thickness of the electron transport layer may be about 100 Å toabout 1,000 Å, and in some embodiments, about 150 Å to about 500 Å. Whenthe thickness of the electron transport layer is within the rangedescribed above, the electron transport layer may have satisfactoryelectron transport characteristics without a substantial increase indriving voltage.

The electron transport layer may further include, in addition to thematerials described above, a metal-containing material.

The metal-containing material may include a Li complex. The Li complexmay include, for example, ET-D1 (lithium quinolate, LiQ) or ET-D2.

The electron transport region may include an electron injection layerthat facilitates the injection of electrons from the second electrode190.

The electron injection layer may be formed on the electron transportlayer using one or more suitable methods selected from vacuumdeposition, spin coating, casting, a LB method, ink-jet printing,laser-printing, and laser-induced thermal imaging. When an electroninjection layer is formed by vacuum deposition and/or spin coating, thedeposition and coating conditions for the electron injection layer maybe similar to the deposition and coating conditions used for the holeinjection layer.

The electron injection layer may include at least one selected from LiF,NaCl, CsF, Li₂O, BaO, and LiQ.

The thickness of the electron injection layer may be about 1 Å to about100 Å, and in some embodiments, about 3 Å to about 90 Å. When thethickness of the electron injection layer is within the ranges describedabove, the electron injection layer may have satisfactory electroninjection characteristics without a substantial increase in drivingvoltage.

The second electrode 190 may be on the organic layer 150. The secondelectrode 190 may be a cathode that is an electron injection electrode,and in this regard, a material for forming the second electrode 190 maybe a material having a low work function, and non-limiting examples ofsuch a material may include metal, an alloy, an electrically conductivecompound, or mixtures thereof. Non-limiting examples of suitablematerial for the second electrode 190 may include lithium (Li),magnesium (Mg), aluminum (Al), aluminum-lithium (Al—Li), calcium (Ca),magnesium-indium (Mg—In), and magnesium-silver (Mg—Ag). In someembodiments, the material for forming the second electrode 190 may beITO or IZO. The second electrode 190 may be a semi-transmissiveelectrode or a transmissive electrode.

Hereinbefore, the organic light-emitting device has been described withreference to the drawing, but embodiments of the present disclosure arenot limited thereto.

Another aspect of embodiments of the present disclosure provides anorganic light-emitting apparatus including the organic light-emittingdevice and a thin film transistor, wherein the first electrode of theorganic light-emitting device is electrically connected to the thin filmtransistor.

The term “C₁-C₆₀ alkyl group” as used herein refers to a linear orbranched aliphatic hydrocarbon monovalent group having 1 to 60 carbonatoms, and non-limiting examples thereof may include a methyl group, anethyl group, a propyl group, an isobutyl group, a sec-butyl group, atert-butyl group, a pentyl group, an iso-amyl group, and a hexyl group.The term “C₁-C₆₀ alkylene group” as used herein refers to a divalentgroup having substantially the same structure as the C₁-C₆₀ alkyl group.

The term “C₁-C₆₀ alkoxy group” as used herein refers to a monovalentgroup represented by —O-A₁₀₁ (wherein A₁₀₁ is a C₁-C₆₀ alkyl group), andnon-limiting examples thereof may include a methoxy group, an ethoxygroup, and an isopropyloxy group.

The term “C₂-C₆₀ alkenyl group” as used herein refers to a hydrocarbongroup formed by substituting at least one carbon-carbon double bond inthe body (e.g., middle) or at the terminus of the C₂-C₆₀ alkyl group,and non-limiting examples thereof may include an ethenyl group, apropenyl group, and a butenyl group. The term “C₂-C₆₀ alkylene group” asused herein refers to a divalent group having substantially the samestructure as the C₂-C₆₀ alkyl group.

The term “C₂-C₆₀ alkynyl group” as used herein refers to a hydrocarbongroup formed by substituting at least one carbon-carbon triple bond inthe body (e.g., middle) or at the terminus of the C₂-C₆₀ alkyl group,and non-limiting examples thereof may include an ethynyl group and apropynyl group. The term “C₂-C₆₀ alkylene group” as used herein refersto a divalent group having substantially the same structure as theC₂-C₆₀ alkyl group.

The term “C₃-C₁₀ cycloalkyl group” as used herein refers to a monovalenthydrocarbon monocyclic group having 3 to 10 carbon atoms, andnon-limiting examples thereof may include a cyclopropyl group, acyclobutyl group, a cyclopentyl group, a cyclohexyl group, and acycloheptyl group. The term “C₃-C₁₀ cycloalkylene group” as used hereinrefers to a divalent group having substantially the same structure asthe C₃-C₁₀ cycloalkyl group.

The term “C₁-C₁₀ heterocycloalkyl group” as used herein refers to amonovalent monocyclic group having at least one heteroatom selected fromN, O, silicon (Si), phosphorus (P), and sulfur (S) as a ring-formingatom in addition to 1 to 10 carbon atoms, and non-limiting examplesthereof may include a tetrahydrofuranyl group and a tetrahydrothiophenylgroup. The term “C₁-C₁₀ heterocycloalkylene group” as used herein refersto a divalent group having substantially the same structure as theC₁-C₁₀ heterocycloalkyl group.

The term “C₃-C₁₀ cycloalkenyl group” as used herein refers to amonovalent monocyclic group that has 3 to 10 carbon atoms and at leastone double bond in the ring thereof and does not have aromaticity, andnon-limiting examples thereof may include a cyclopentenyl group, acyclohexenyl group, and a cycloheptenyl group. The term “C₃-C₁₀cycloalkenylene group” as used herein refers to a divalent group havingsubstantially the same structure as the C₃-C₁₀ cycloalkenyl group.

The term “C₁-C₁₀ heterocycloalkenyl group” as used herein refers to amonovalent monocyclic group that has at least one heteroatom selectedfrom N, O, Si, P, and S as a ring-forming atom, 1 to 10 carbon atoms,and at least one double bond in its ring. Non-limiting examples of theC₁-C₁₀ heterocycloalkenyl group may include a 2,3-hydrofuranyl group anda 2,3-hydrothiophenyl group. The term “C₁-C₁₀ heterocycloalkenylenegroup” as used herein refers to a divalent group having substantiallythe same structure as the C₁-C₁₀ heterocycloalkenyl group.

The term “C₆-C₆₀ aryl group” as used herein refers to a monovalent grouphaving a carbocyclic aromatic system having 6 to 60 carbon atoms, andthe term “C₆-C₆₀ arylene group” as used herein refers to a divalentgroup having a carbocyclic aromatic system having 6 to 60 carbon atoms.Non-limiting examples of the C₆-C₆₀ aryl group may include a phenylgroup, a biphenyl group, a terphenyl group, a naphthyl group, ananthracenyl group, a phenanthrenyl group, a pyrenyl group, and achrysenyl group. When the C₆-C₆₀ aryl group and the C₆-C₆₀ arylene groupeach include two or more rings, the rings may be fused to each other.

The term “C₁-C₆₀ heteroaryl group” as used herein refers to a monovalentgroup having a carbocyclic aromatic system that has at least oneheteroatom selected from N, O, Si, P, and S as a ring-forming atom, and1 to 60 carbon atoms. The term “C₁-C₆₀ heteroarylene group” as usedherein refers to a divalent group having a carbocyclic aromatic systemthat has at least one heteroatom selected from N, O, P, and S as aring-forming atom, and 1 to 60 carbon atoms. Non-limiting examples ofthe C₁-C₆₀ heteroaryl group may include a pyridinyl group, a pyrimidinylgroup, a pyrazinyl group, a pyridazinyl group, a triazinyl group, aquinolinyl group, and an isoquinolinyl group. When the C₁-C₆₀ heteroarylgroup and the C₁-C₆₀ heteroarylene group each include two or more rings,the rings may be fused to each other.

The term “C₆-C₆₀ aryloxy group” as used herein indicates —O-A₁₀₂(wherein A₁₀₂ is the C₆-C₆₀ aryl group), and the term “C₆-C₆₀ arylthiogroup” as used herein indicates —S-A₁₀₃ (wherein A₁₀₃ is the C₆-C₆₀ arylgroup).

The term “monovalent non-aromatic condensed polycyclic group” as usedherein refers to a monovalent group that has two or more rings condensedto each other, only carbon atoms as ring forming atoms (for example, 8to 60 carbon atoms), and non-aromaticity in the entire molecularstructure. A non-limiting example of the monovalent non-aromaticcondensed polycyclic group may include a fluorenyl group. The term“divalent non-aromatic condensed polycyclic group” as used herein refersto a divalent group having substantially the same structure as themonovalent non-aromatic condensed polycyclic group.

The term “monovalent non-aromatic condensed heteropolycyclic group” asused herein refers to a monovalent group having two or more ringscondensed to each other, a heteroatom selected from N, O, Si, P, and Sas a ring forming atom in addition to carbon atoms (for example, 1 to 60carbon atoms), and has non-aromaticity in the entire molecularstructure. A non-limiting example of the monovalent non-aromaticcondensed heteropolycyclic group may include a carbazolyl group. Theterm “divalent non-aromatic condensed heteropolycyclic group” as usedherein refers to a divalent group having substantially the samestructure as the monovalent non-aromatic condensed heteropolycyclicgroup.

In the present specification, at least one substituent of thesubstituted C₅-C₃₀ carbocyclic group, substituted C₁-C₃₀ heterocyclicgroup, substituted C₁-C₅ alkylene group, substituted C₂-C₅ alkenylenegroup, substituted C₃-C₁₀ cycloalkylene group, substituted C₁-C₁₀heterocycloalkylene group, substituted C₃-C₁₀ cycloalkenylene group,substituted C₁-C₁₀ heterocycloalkenylene group, substituted C₆-C₆₀arylene group, substituted C₁-C₆₀ heteroarylene group, substituteddivalent non-aromatic condensed polycyclic group, substituted divalentnon-aromatic condensed heteropolycyclic group, substituted C₁-C₆₀ alkylgroup, substituted C₂-C₆₀ alkenyl group, substituted C₂-C₆₀ alkynylgroup, substituted C₁-C₆₀ alkoxy group, substituted C₃-C₁₀ cycloalkylgroup, substituted C₁-C₁₀ heterocycloalkyl group, substituted C₃-C₁₀cycloalkenyl group, substituted C₁-C₁₀ heterocycloalkenyl group,substituted C₆-C₆₀ aryl group, substituted C₆-C₆₀ aryloxy group,substituted C₆-C₆₀ arylthio group, substituted C₁-C₆₀ heteroaryl group,substituted monovalent non-aromatic condensed polycyclic group, andsubstituted monovalent non-aromatic condensed heteropolycyclic group maybe selected from the group consisting of:

deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and aC₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group,—Si(Q₁₁)(Q₁₂)(Q₁₃), and —B(Q₁₄)(Q₁₅),

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group, each substituted with least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, aC₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —Si(Q₂₁)(Q₂₂)(Q₂₃), and —B(Q₂₄)(Q₂₅),and

—Si(Q₃₁)(Q₃₂)(Q₃₃) and —B(Q₃₄)(Q₃₅),

wherein Q₁₁ to Q₁₅, Q₂₁ to Q₂₅, and Q₃₁ to Q₃₅ may each independently beselected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, aC₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group,a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroarylgroup, a monovalent non-aromatic condensed polycyclic group, amonovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group.

The term “Ph” as used herein refers to a phenyl group, the term “Me” asused herein refers to a methyl group, the term “Et” as used hereinrefers to an ethyl group, and the term “ter-Bu” or “Bu^(t)” as usedherein refers to a tert-butyl group.

The term “biphenyl group” as used herein refers to a monovalent grouphaving two benzene rings linked to each other via a single bond, and theterm “terphenyl group” as used herein refers to a monovalent grouphaving three benzene rings linked to each other via two single bonds.

Hereinafter, an organic light-emitting device according to an embodimentof the present disclosure will be described in more detail withreference to Synthesis Examples and Examples. The wording “B was usedinstead of A” used in describing Synthesis Examples below indicates thatan identical amount (e.g., molar equivalent) of B was used in place ofA.

EXAMPLE Example 1

A 15 Ohms per square centimeter (Q/cm²) 1200 Å (Angstroms) ITO glasssubstrate (available from Corning Co., Ltd) was cut to a size of 50millimeters (mm)×50 mm×0.5 mm, sonicated in isopropyl alcohol and purewater for 10 minutes in each solvent, cleaned with ultraviolet rays for10 minutes, cleaned with ozone, and then mounted on a vacuum depositionapparatus.

2-TNATA was vacuum-deposited on the ITO anode of the glass substrate toform a hole injection layer having a thickness of about 600 Å. NPB wasthen vacuum-deposited on the hole injection layer to form a holetransport layer having a thickness of about 300 Å.

Compounds 1-1 and 2-2 (host) and Compound PD1 (dopant) were co-depositedon the hole transport layer at a weight ratio of about 20:70:10 to forman emission layer having a thickness of about 400 Å.

Alq₃ was vacuum-deposited on the emission layer to form an electrontransport layer having a thickness of about 300 Å, and Al wasvacuum-deposited on the electron transport layer to form a cathodehaving a thickness of about 2,000 Å, thereby completing the manufactureof an organic light-emitting device.

Examples 2 to 18 and Comparative Examples 1 to 7

Organic light-emitting devices according to Examples 2 to 18 andComparative Examples 1 to 7 were manufactured in substantially the samemanner as in Example 1, except that in forming an emission layer, thehost was varied as shown in Table 1.

Evaluation Example 1

The driving voltage, efficiency, and lifespan (T₉₀) of each organiclight-emitting device manufactured in Examples 1 to 18 and ComparativeExamples 1 to 7 were measured using a Keithley 236 source-measure unit(SMU) and a PR650 luminance meter. The results thereof are shown inTable 1. The lifespan (T₉₀) refers to the period of time required forthe initial luminance of the organic light-emitting device to reduce by90%.

TABLE 1 Weight ratio (First Lifespan Host Dopant compound:second Current(T₉₀) (hr) (First (Second (Third compound:third density Efficiency (@3700 compound) compound) compound) compound) (mA/cm²) (cd/A) cd/m²)Example 1 Compound 1-1 Compound 2-2 Compound PD1 25:65:10 10 55.8 143Example 2 Compound 1-1 Compound 2-2 Compound PD1 15:75:10 10 41.4 190Example 3 Compound 1-7 Compound 2-2 Compound PD1 40:50:10 10 48.2 224Example 4 Compound 1-7 Compound 2-2 Compound PD1 25:65:10 10 43.8 250Example 5 Compound 1-10 Compound 2-2 Compound PD1 30:60:10 10 32.2 130Example 6 Compound 1-10 Compound 2-2 Compound PD1 20:70:10 10 35.2 95Example 7 Compound 1-1 Compound 2-3 Compound PD1 30:60:10 10 64.4 206Example 8 Compound 1-1 Compound 2-3 Compound PD1 20:70:10 10 47.7 277Example 9 Compound 1-7 Compound 2-3 Compound PD1 40:50:10 10 55.6 129Example 10 Compound 1-7 Compound 2-3 Compound PD1 30:60:10 10 50.5 188Example 11 Compound 1-10 Compound 2-3 Compound PD1 35:55:10 10 28.5 100Example 12 Compound 1-10 Compound 2-3 Compound PD1 25:65:10 10 40.7 120Example 13 Compound 1-1 Compound 2-8 Compound PD1 40:50:10 10 45.0 145Example 14 Compound 1-1 Compound 2-8 Compound PD1 25:55:10 10 33.3 166Example 15 Compound 1-7 Compound 2-8 Compound PD1 30:60:10 10 39.9 115Example 16 Compound 1-7 Compound 2-8 Compound PD1 20:70:10 10 35.3 172Example 17 Compound 1-10 Compound 2-8 Compound PD1 60:30:10 10 35.8 88Example 18 Compound 1-10 Compound 2-8 Compound PD1 40:50:10 10 28.3 84Comparative Compound 1-1 — Compound PD1 90:10 10 30.0 25 Example 1Comparative Compound 1-7 — Compound PD1 90:10 10 36.0 19 Example 2Comparative — Compound 2-3 Compound PD1 90:10 10 4.9 5 Example 3Comparative — Compound 2-8 Compound PD1 90:10 10 13.6 9 Example 4Comparative Compound 1-10 — Compound PD1 90:10 10 21.7 15 Example 5Comparative Compound A Compound 2-8 Compound PD1 40:50:10 10 20.4 68Example 6 Comparative Compound B Compound 2-8 Compound PD1 40:50:10 1023.6 72 Example 7

Referring to the results shown in Table 1, it was found that each of theorganic light-emitting devices manufactured in Examples 1 to 18exhibited higher efficiencies and longer lifespans than each of theorganic light-emitting devices manufactured in Comparative Examples 1 to7.

As described above, according to the one or more example embodiments ofthe present disclosure, an organic light-emitting device may have a highefficiency and a long lifespan.

It should be understood that the example embodiments described hereinshould be considered in a descriptive sense only and not for purposes oflimitation. Descriptions of features or aspects within each exampleembodiment should typically be considered as available for other similarfeatures or aspects in other example embodiments.

As used herein, the terms “use”, “using”, and “used” may be consideredsynonymous with the terms “utilize”, “utilizing”, and “utilized”,respectively. Further, the use of “may” when describing embodiments ofthe present disclosure refers to “one or more embodiments of the presentdisclosure”.

As used herein, the terms “substantially”, “about”, and similar termsare used as terms of approximation and not as terms of degree, and areintended to account for the inherent deviations in measured orcalculated values that would be recognized by those of ordinary skill inthe art.

Also, any numerical range recited herein is intended to include allsubranges of the same numerical precision subsumed within the recitedrange. For example, a range of “1.0 to 10.0” is intended to include allsubranges between (and including) the recited minimum value of 1.0 andthe recited maximum value of 10.0, that is, having a minimum value equalto or greater than 1.0 and a maximum value equal to or less than 10.0,such as, for example, 2.4 to 7.6. Any maximum numerical limitationrecited herein is intended to include all lower numerical limitationssubsumed therein and any minimum numerical limitation recited in thisspecification is intended to include all higher numerical limitationssubsumed therein. Accordingly, Applicant reserves the right to amendthis specification, including the claims, to expressly recite anysub-range subsumed within the ranges expressly recited herein.

While one or more example embodiments have been described with referenceto the drawing, it will be understood by those of ordinary skill in theart that various changes in form and details may be made therein withoutdeparting from the spirit and scope as defined by the following claimsand equivalents thereof.

What is claimed is:
 1. An organic light-emitting device comprising: afirst electrode; a second electrode facing the first electrode; and anorganic layer comprising an emission layer between the first electrodeand the second electrode, wherein the organic layer comprises a firstcompound and a second compound, the first compound is selected fromcompounds represented by Formula 1, and the second compound is selectedfrom compounds represented by Formula 2:

wherein, in Formulae 1 and 2, ring A₁ is selected from a C₅-C₃₀carbocyclic group and a C₁-C₃₀ heterocyclic group, X₁ is selected from Oand S, L₁ to L₄ and L₂₁ to L₂₃ are each independently selected from asubstituted or unsubstituted C₃-C₁₀ cycloalkylene group, a substitutedor unsubstituted C₁-C₁₀ heterocycloalkylene group, a substituted orunsubstituted C₃-C₁₀ cycloalkenylene group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenylene group, a substituted orunsubstituted C₆-C₆₀ arylene group, a substituted or unsubstitutedC₁-C₆₀ heteroarylene group, a substituted or unsubstituted divalentnon-aromatic condensed polycyclic group, and a substituted orunsubstituted divalent non-aromatic condensed heteropolycyclic group, a1to a4 and a21 to a23 are each independently selected from 0, 1, 2, and3, R₁ to R₆, R₁₁, R₁₂, and R₂₁ to R₂₃ are each independently selectedfrom hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, asubstituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted orunsubstituted C₂-C₆₀ alkynyl group, a substituted or unsubstitutedC₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkylgroup, a substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, —Si(Q₁)(Q₂)(Q₃), —B(Q₄)(Q₅), and —N(Q₆)(Q₇), b1to b6 and b21 to b23 are each independently an integer selected from 0to 10, n21 to n23 are each independently an integer selected from 0 to4, and at least one substituent of the substituted C₅-C₃₀ carbocyclicgroup, substituted C₁-C₃₀ heterocyclic group, substituted C₁-C₁₀heterocycloalkylene group, substituted C₃-C₁₀ cycloalkenylene group,substituted C₁-C₁₀ heterocycloalkenylene group, substituted C₆-C₆₀arylene group, substituted C₁-C₆₀ heteroarylene group, substituteddivalent non-aromatic condensed polycyclic group, substituted divalentnon-aromatic condensed heteropolycyclic group, substituted C₁-C₆₀ alkylgroup, substituted C₂-C₆₀ alkenyl group, substituted C₂-C₆₀ alkynylgroup, substituted C₁-C₆₀ alkoxy group, substituted C₃-C₁₀ cycloalkylgroup, substituted C₁-C₁₀ heterocycloalkyl group, substituted C₃-C₁₀cycloalkenyl group, substituted C₁-C₁₀ heterocycloalkenyl group,substituted C₆-C₆₀ aryl group, substituted C₆-C₆₀ aryloxy group,substituted C₆-C₆₀ arylthio group, substituted C₁-C₆₀ heteroaryl group,substituted monovalent non-aromatic condensed polycyclic group, andsubstituted monovalent non-aromatic condensed heteropolycyclic group isselected from the group consisting of: deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid group ora salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenylgroup, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group; a C₁-C₆₀ alkylgroup, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀alkoxy group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —Si(Q₁₁)(Q₁₂)(Q₁₃),—B(Q₁₄)(Q₁₅), and —N(Q₁₆)(Q₁₇), a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, a biphenyl group, and a terphenylgroup; a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, aC₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group, each substituted with at least oneselected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynylgroup, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —Si(Q₂₁)(Q₂₂)(Q₂₃), —B(Q₂₄)(Q₂₅), and—N(Q₂₆)(Q₂₇); and —Si(Q₃₁)(Q₃₂)(Q₃₃), —B(Q₃₄)(Q₃₅), and —N(Q₃₆)(Q₃₇),wherein Q₁ to Q₇, Q₁₁ to Q₁₇, Q₂₁ to Q₂₇, and Q₃₁ to Q₃₇ are eachindependently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid group ora salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenylgroup, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group.
 2. The organic light-emitting device ofclaim 1, wherein ring A₁ in Formula 1 is selected from a benzene, anaphthalene, a fluorene, a spiro-fluorene, a phenanthrene, ananthracene, a pyrrole, a thiophene, a furan, an imidazole, a pyrazole, athiazole, an isothiazole, an oxazole, an isoxazole, a pyridine, apyrazine, a pyrimidine, a pyridazine, an iso-indole, an indole, anindazole, a quinoline, an isoquinoline, a benzoquinoline, a quinoxaline,a quinazoline, a phthalazinine, a naphthylidine, a phenanthroline, abenzimidazole, a benzofuran, a benzothiophene, a benzothiazole, abenzoxazole, an isobenzoxazole, and a triazine.
 3. The organiclight-emitting device of claim 1, wherein X₁ in Formula 1 is O.
 4. Theorganic light-emitting device of claim 1, wherein L₁ to L₄ and L₂₁ toL₂₃ are each independently selected from the group consisting of: aphenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, apyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a thiadiazolylene group, animidazopyridinylene group, and an imidazopyrimidinylene group; and aphenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, apyrrolylene group, a thiophenylene group, a furanylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an isoindolylene group, an indolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a carbazolylene group, aphenanthridinylene group, an acridinylene group, a phenanthrolinylenegroup, a phenazinylene group, a benzimidazolylene group, abenzofuranylene group, a benzothiophenylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a thiadiazolylene group, animidazopyridinylene group, and an imidazopyrimidinylene group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptylgroup, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, abiphenyl group, a terphenyl group, a pentalenyl group, an indenyl group,a naphthyl group, an azulenyl group, a heptalenyl group, an indacenylgroup, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group,a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a thiadiazolyl group, animidazopyridinyl group, an imidazopyrimidinyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃),—B(Q₃₄)(Q₃₅), and —N(Q₃₆)(Q₃₇), wherein Q₃₁ to Q₃₇ are eachindependently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid group ora salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenylgroup, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group.
 5. The organic light-emitting device ofclaim 1, wherein L₁ to L₄ and L₂₁ to L₂₃ are each independently selectedfrom groups represented by Formulae 3-1 to 3-18:

wherein, in Formulae 3-1 to 3-18, Z₁ is selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a C₂-C₂₀ alkynyl group, a C₁-C₂₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group,an anthracenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group,a quinoxalinyl group, a quinazolinyl group, a benzofuranyl group, abenzothiophenyl group, an isobenzothiazolyl group, a dibenzofuranylgroup, a dibenzothiophenyl group, a carbazolyl group, a triazinyl group,—Si(Q₃₁)(Q₃₂)(Q₃₃), —B(Q₃₄)(Q₃₅), and —N(Q₃₆)(Q₃₇), wherein Q₃₁ to Q₃₇are each independently selected from hydrogen, deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group, d1 is an integer selected from 1 to 4, d2is an integer selected from 1 to 3, d3 is an integer selected from 1 to6, d5 is selected from 1 and 2, d6 is an integer selected from 1 to 5,and * and *′ each indicate a binding site to a neighboring atom.
 6. Theorganic light-emitting device of claim 1, wherein L₁ to L₄ and L₂₁ toL₂₃ are each independently selected from groups represented by Formulae4-1 to 4-26:

wherein * and *′ in Formulae 4-1 to 4-26 each indicate a binding site toa neighboring atom.
 7. The organic light-emitting device of claim 1,wherein, in Formula 1, a1 is 0, a2 is 0, a3 is 0, and a4 is 0; a1 is 0,a2 is 1, a3 is 0, and a4 is 0; a1 is 0, a2 is 0, a3 is 1, and a4 is 0;or a1 is 0, a2 is 1, a3 is 1, and a4 is 0, and wherein, in Formula 2,a21 is 1, a22 is 0, and a23 is O.
 8. The organic light-emitting deviceof claim 1, wherein R₁ to R₆, R₁₁, R₁₂, and R₂₁ to R₂₃ are eachindependently selected from the group consisting of: hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group; a phenyl group,a biphenyl group, a terphenyl group, a naphthyl group, a fluorenylgroup, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a triazinyl group, a benzocarbazolyl group, and adibenzocarbazolyl group; and a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, a triazinyl group, abenzocarbazolyl group, and a dibenzocarbazolyl group, each substitutedwith at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group,a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, acarbazolyl group, a triazinyl group, a benzocarbazolyl group, adibenzocarbazolyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —B(Q₃₄)(Q₃₅), and—N(Q₃₆)(Q₃₇); and —Si(Q₁)(Q₂)(Q₃), —B(Q₄)(Q₅), and —N(Q₆)(Q₇), whereinQ₁ to Q₇ and Q₃₁ to Q₃₇ are each independently selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, and a triazinyl group.
 9. Theorganic light-emitting device of claim 1, wherein R₁ to R₆, R₁₁, R₁₂,and R₂₁ to R₂₃ are each independently selected from hydrogen, deuterium,—F, —Cl, —Br, —I, a methyl group, an ethyl group, a propyl group, aniso-propyl group, a butyl group, an iso-butyl group, a sec-butyl group,a tert-butyl group, a methoxy group, an ethoxy group, an iso-propoxygroup, a butoxy group, an iso-butoxy group, a sec-butoxy group, atert-butoxy group, and a group represented by any of Formulae 6-1 to6-69:

wherein, in Formulae 6-1 to 6-69, Y₁₁ is selected from O, S, S(═O),S(═O)₂, C(Z₁₄)(Z₁₅), N(Z₁₆), and Si(Z₁₇)(Z₁₈), Z₁₁ to Z₁₈ are eachindependently selected from the group consisting of: hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀alkyl group, and a C₁-C₂₀ alkoxy group; a C₁-C₂₀ alkyl group and aC₁-C₂₀ alkoxy group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amino group, an amidino group, a hydrazine group, a hydrazonegroup, a carboxylic acid group or a salt thereof, a sulfonic acid groupor a salt thereof, and a phosphoric acid group or a salt thereof; aphenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolylgroup, a thiophenyl group, a furanyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, apyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a benzimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, an oxadiazolyl group, atriazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, animidazopyridinyl group, and an imidazopyrimidinyl group; a phenyl group,a biphenyl group, a terphenyl group, a naphthyl group, a fluorenylgroup, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolylgroup, a thiophenyl group, a furanyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, apyrimidinyl group, a pyridazinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, aquinazolinyl group, a carbazolyl group, a benzimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, an oxadiazolyl group, atriazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, animidazopyridinyl group, and an imidazopyrimidinyl group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl group, a C₁-C₁₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a fluorenyl group, a spiro-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group,an anthracenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group,an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, aquinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aquinoxalinyl group, a quinazolinyl group, a carbazolyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, an imidazopyridinyl group, animidazopyrimidinyl group, —Si(Q₂₁)(Q₂₂)(Q₂₃), —B(Q₂₄)(Q₂₅), and—N(Q₂₆)(Q₂₇); and —Si(Q₃₁)(Q₃₂)(Q₃₃), —B(Q₃₄)(Q₃₅), and —N(Q₃₆)(Q₃₇),wherein Q₁ to Q₃, Q₆, Q₇, Q₂₁ to Q₂₇, and Q₃₁ to Q₃₇ are eachindependently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid group ora salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxygroup, a phenyl group, a biphenyl group, a terphenyl group, a naphthylgroup, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenylgroup, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenylgroup, a pyrenyl group, a chrysenyl group, and a carbazolyl group, e1 isan integer selected from 1 to 5, e2 is an integer selected from 1 or 2,e3 is an integer selected from 1 to 3, e4 is an integer selected from 1to 4, e5 is one selected from 1 to 5, e6 is one selected from 1 to 6, e7is an integer selected from 1 to 7, and * indicates a binding site to aneighboring atom.
 10. The organic light-emitting device of claim 1,wherein R₁ to R₆, R₁₁, R₁₂, and R₂₁ to R₂₃ are each independentlyselected from hydrogen, deuterium, —F, —Cl, —Br, —I, a methyl group, anethyl group, a propyl group, an iso-propyl group, a butyl group, aniso-butyl group, a sec-butyl group, a tert-butyl group, a methoxy group,an ethoxy group, an iso-propoxy group, a butoxy group, an iso-butoxygroup, a sec-butoxy group, a tert-butoxy group, and a group representedby any of Formulae 7-1 to 7-83:

wherein * in Formulae 7-1 to 7-83 indicates a binding site to aneighboring atom.
 11. The organic light-emitting device of claim 10,wherein: R₁, R₂, and R₂₁ are each independently selected from groupsrepresented by Formulae 7-1 to 7-83, and R₃ to R₆, R₁₁, R₁₂, R₂₂, andR₂₃ are each independently selected from hydrogen, deuterium, —F, —Cl,—Br, —I, a methyl group, an ethyl group, a propyl group, an iso-propylgroup, a butyl group, an iso-butyl group, a sec-butyl group, atert-butyl group, a methoxy group, an ethoxy group, an iso-propoxygroup, a butoxy group, an iso-butoxy group, a sec-butoxy group, and atert-butoxy group.
 12. The organic light-emitting device of claim 1,wherein the first compound is selected from compounds represented byFormulae 1-1 to 1-4:

wherein, in Formulae 1-1 to 1-4, ring A₁, X₁, L₁ to L₄, a1 to a4, R₁ toR₆, R₁₁, R₁₂, and b1 to b6 are each the same as described herein inconnection with Formula
 1. 13. The organic light-emitting device ofclaim 1, wherein the first compound is selected from compoundsrepresented by Formulae 1-1-1 to 1-1-4:

wherein, in Formulae 1-1-1 to 1-1-4, X₁, L₂, L₃, a2, a3, R₂ to R₆, R₁₁,R₁₂, b1, b2, and b4 to b6 are each the same as described herein inconnection with Formula 1, Z₁₁ is selected from hydrogen, deuterium, —F,—Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an aminogroup, an amidino group, a hydrazine group, a hydrazone group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, afluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, apyrenyl group, a chrysenyl group, a carbazolyl group, a benzocarbazolylgroup, and a dibenzocarbazolyl group, b3a is an integer selected from 0to 4, b3b is an integer selected from 0 to 6, and e1 is an integerselected from 0 to
 5. 14. The organic light-emitting device of claim 1,wherein the second compound is selected from compounds represented byFormulae 2-1 and 2-2:

wherein, in Formulae 2-1 and 2-2, L₂₁, a21, and b21 are each the same asdescribed herein in connection with Formula 2, R_(21a) to R_(21d) areeach the same as described herein in connection with R₂₁, R_(22a) toR_(22d) are each the same as described herein in connection with R₂₂,and R_(23a) to R_(23d) are each the same as described herein inconnection with R₂₃.
 15. The organic light-emitting device of claim 1,wherein the first compound is selected from Compounds 1-1 to 1-54, andthe second compound is selected from Compounds 2-1 to 2-24:


16. The organic light-emitting device of claim 1, wherein a weight ratioof the first compound and the second compound is 1:9 to 9:1.
 17. Theorganic light-emitting device of claim 1, wherein the first compound andthe second compound are comprised in the emission layer.
 18. The organiclight-emitting device of claim 1, wherein the organic layer furthercomprises a third compound, and the third compound is selected fromorganometallic complexes represented by Formula 401:

wherein, in Formula 401, M is selected from iridium (Ir), platinum (Pt),osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu),terbium (Tb), and thulium (Tm), X₄₀₁ to X₄₀₄ are each independentlyselected from nitrogen and carbon, rings A₄₀₁ and A₄₀₂ are eachindependently selected from a substituted or unsubstituted benzene, asubstituted or unsubstituted naphthalene, a substituted or unsubstitutedfluorene, a substituted or unsubstituted spiro-fluorene, a substitutedor unsubstituted indene, a substituted or unsubstituted pyrrole, asubstituted or unsubstituted thiophene, a substituted or unsubstitutedfuran, a substituted or unsubstituted imidazole, a substituted orunsubstituted pyrazole, a substituted or unsubstituted thiazole, asubstituted or unsubstituted isothiazole, a substituted or unsubstitutedoxazole, a substituted or unsubstituted isoxazole, a substituted orunsubstituted pyridine, a substituted or unsubstituted pyrazine, asubstituted or unsubstituted pyrimidine, a substituted or unsubstitutedpyridazine, a substituted or unsubstituted quinoline, a substituted orunsubstituted isoquinoline, a substituted or unsubstitutedbenzoquinoline, a substituted or unsubstituted quinoxaline, asubstituted or unsubstituted quinazoline, a substituted or unsubstitutedcarbazole, a substituted or unsubstituted benzimidazole, a substitutedor unsubstituted benzofuran, a substituted or unsubstitutedbenzothiophene, a substituted or unsubstituted isobenzothiophene, asubstituted or unsubstituted benzoxazole, a substituted or unsubstitutedisobenzoxazole, a substituted or unsubstituted triazole, a substitutedor unsubstituted oxadiazole, a substituted or unsubstituted triazine, asubstituted or unsubstituted dibenzofuran, and a substituted orunsubstituted dibenzothiophene, and when A₄₀₁ has two or moresubstituents, the two or more substituents of A₄₀₁ bind (e.g., couple)to each other to form a saturated or unsaturated ring, and when A₄₀₂ hastwo or more substituents, the two or more substituents of A₄₀₂ bind(e.g., couple) to each other to form a saturated or unsaturated ring, atleast one substituent of the substituted benzene, substitutednaphthalene, substituted fluorene, substituted spiro-fluorene,substituted indene, substituted pyrrole, substituted thiophene,substituted furan, substituted imidazole, substituted pyrazole,substituted thiazole, substituted isothiazole, substituted oxazole,substituted isoxazole, substituted pyridine, substituted pyrazine,substituted pyrimidine, substituted pyridazine, substituted quinoline,substituted isoquinoline, substituted benzoquinoline, substitutedquinoxaline, substituted quinazoline, substituted carbazole, substitutedbenzimidazole, substituted benzofuran, substituted benzothiophene,substituted isobenzothiophene, substituted benzoxazole, substitutedisobenzoxazole, substituted triazole, substituted oxadiazole,substituted triazine, substituted dibenzofuran, and substituteddibenzothiophene is selected from the group consisting of: deuterium,—F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, anamino group, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkylgroup, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀alkoxy group; a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀alkynyl group, and a C₁-C₆₀ alkoxy group, each substituted with at leastone selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, aC₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group,—N(Q₄₀₁)(Q₄₀₂), —Si(Q₄₀₃)(Q₄₀₄)(Q₄₀₅), and —B(Q_(4o6))(Q_(4o7)), aC₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group; a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, and a monovalentnon-aromatic condensed heteropolycyclic group, each substituted with atleast one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, aC₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group,a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₄₁₁)(Q₄₁₂), —Si(Q₄₁₃)(Q₄₁₄)(Q₄₁₅),and —B(Q₄₁₆)(Q₄₁₇); and —N(Q₄₂₁)(Q₄₂₂), —Si(Q₄₂₃)(Q₄₂₄)(Q₄₂₅), and—B(Q₄₂₆)(Q₄₂₇), L₄₀₁ is an organic ligand, xc1 is selected from 1, 2,and 3, and xc2 is selected from 0, 1, 2, and 3, wherein Q₄₀₁ to Q₄₀₇,Q₄₁₁ to Q₄₁₇, and Q₄₂₁ to Q₄₂₇ are each independently selected fromhydrogen, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₆-C₆₀ arylgroup, and a C₁-C₆₀ heteroaryl group.
 19. The organic light-emittingdevice of claim 18, wherein: the emission layer comprises a host and adopant, the host comprises the first compound and the second compound,and the dopant comprises the third compound.
 20. The organiclight-emitting device of claim 19, wherein a weight ratio of the hostand the dopant is 7:3 to 9.5:0.5.